dc.contributor.authorZhao, Daming
dc.contributor.authorSkelton, Jonathan M.
dc.contributor.authorHu, Hongwei
dc.contributor.authorLa-o-vorakiat, Chan
dc.contributor.authorZhu, Jian-Xin
dc.contributor.authorMarcus, Rudolph A.
dc.contributor.authorMichel-Beyerle, Maria-Elisabeth
dc.contributor.authorLam, Yeng Ming
dc.contributor.authorWalsh, Aron
dc.contributor.authorChia, Elbert E. M.
dc.identifier.citationZhao, D., Skelton, J. M., Hu, H., La-o-vorakiat, C., Zhu, J.-X., Marcus, R. A., et al. (2017). Low-frequency optical phonon modes and carrier mobility in the halide perovskite CH3NH3PbBr3 using terahertz time-domain spectroscopy. Applied Physics Letters, 111(20), 201903-.en_US
dc.description.abstractAs a light absorber in photovoltaic applications, hybrid organic-inorganic halide perovskites should have long and balanced diffusion lengths for both the separated electrons and holes before recombination, which necessitates high carrier mobility. In polar semiconductors, the room-temperature carrier mobility is often limited by the scattering between carriers and the lowest-frequency optical phonon modes. Using terahertz time-domain spectroscopy, we examine the temperature evolution of these phonon modes in CH3NH3PbBr3 and obtained high carrier mobility values using Feynman's polaron theory. This method allows us to estimate the upper limit of carrier mobilities without the need to create photogenerated free carriers, and can be applied to other heteropolar semiconductor systems with large polarons.en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.format.extent5 p.en_US
dc.relation.ispartofseriesApplied Physics Lettersen_US
dc.rights© 2017 AIP Publishing. This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of AIP Publishing. The published version is available at: [https://doi.org/10.1063/1.4993524]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.en_US
dc.subjectElectronic Transporten_US
dc.titleLow-frequency optical phonon modes and carrier mobility in the halide perovskite CH3NH3PbBr3 using terahertz time-domain spectroscopyen_US
dc.typeJournal Article
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.description.versionPublished versionen_US

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